Tree stand



FIG. 1 is a front elevational view of a tree stand showing our newdesign;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof similar to FIG. 1 wherein thetree stand has been rotated 90°; and

FIG. 4 is a bottom plan view thereof.

The ornamental design for a tree stand, as shown and described.